1. something you use if you cant reach halfway across the keyboard to use a shortcut with Shift, Ctrl, or Alt.
2. an annoying default feature of Microsoft where if you press Shift five times, a popup asking whether you want to enable StickyKeys, ruining any streak you have if you're playing an FPS. Can be used to annoy random people

Person 1: OMG HOW DO I GET MY 100TH KILL STREAK WITHOUT DYING???
Person 2: Press Shift 5 times right when an enemy sees you to get a quick armor boost
Person 1: Thanks, man. You're my god!
...
Person 1: WTF IS THIS SHIT NO I DONT WANT STICKY KEYS WTF STUPID MICROSOFT!!!!!!! NOOOOOOO I DIED!!!!!!!!! WTF YOU HACKER!!!!!!!

Talking to a girl you like on facebook whilst masturbating onto the keyboard of your computer thinking about her (images of albums such as Corfu 2008 can be used). The keys that the leftover juices land on are the ones you have to enter in chat to her. The longer the message the more you love her. Simple.

You: qdctbukmop
Girl: What's that ?
You: Have you never heard of sticky keys ?
Girl: Ohhh sorry just thought you left your phone in your pocket. Love you too !

Press shift 5 times to activate.
It is supposed to allow you to use either SHIFT, CTRL, ALT and the Windows logo by pressing one key, but people I know refer it to some awesome joke, as they yell "STICKYKEYS!" in random places and at random times.